帶有修復程序的JScrollPane中的JEditorPane背景圖片

我使用以下片段創建Chatlog。帶有修復程序的JScrollPane中的JEditorPane背景圖片

 chatlog = new JEditorPane("text/html", "<html>") { 
     private static final long serialVersionUID = 1L; 

     protected void paintComponent(Graphics g) { 
      // set background green - but can draw image here too 
      g.setColor(new Color(0,0,0,0)); 
      g.fillRect(0, 0, getWidth(), getHeight()); 

      // uncomment the following to draw an image 
      Image img; 
      try { 
       img = ImageIO.read(new File("images/chatlog.png")); 
       g.drawImage(img, 0, 0, this); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

      super.paintComponent(g); 
     } 
    }; 

    chatlog.setFont(new Font("Segoe UI", Font.PLAIN, 14)); 
    chatlog.setEditable(false); 
    chatlog.setOpaque(false); 

    chatScroll = new JScrollPane(chatlog); 
    chatScroll.setBounds(4, 454, 620, 100); 
    chatScroll.setOpaque(false); 
    chatScroll.setBackground(new Color(0,0,0,0)); 
    chatScroll.setBorder(BorderFactory.createEmptyBorder()); 
    chatScroll.setVisible(false);

就像你看到的，我在JEditorPane中使用了背景圖像。但是，如果我將大量內容寫入Chatlog，背景圖像將隨文本一起移動。

你能幫我嗎？

來源

2014-01-12 OKrah

無關：不做組件的任何手動尺寸/定位，永遠 - 這就是佈局管理的全部責任。 – kleopatra

相關：是的，在編輯器頂部繪製時還應該做些什麼:-)要麼縮放以填充整個窗格（可能看起來有點奇怪），要麼將其繪製爲viewPort的背景 – kleopatra

在標準HTML中，我們將使用background-attachment: scroll; CSS屬性強制BG在頁面滾動時隨頁面一起向下滾動。將黃色圓點放在樣式中作爲背景，以顯示Swing如何實現該屬性。另一方面，寬的短黑色圖像由滾動窗格本身繪製，因此出現在我們想要繪製它的任何位置。

enter image description here

import java.awt.*; 
import java.awt.image.BufferedImage; 
import javax.swing.*; 
import javax.swing.border.EmptyBorder; 

public class BackgroundImageInHTML { 

    // the GUI as seen by the user (without frame) 
    private JPanel gui; 
    private final static String HTML = "<html>" 
      + "<head>" 
      + "<style type=text/css>" 
      + "body {" 
      + " background-image: http://i.stack.imgur.com/IHARa.png;" 
      + " background-repeat:no-repeat;" 
      + " background-position:left top;" 
      + " background-attachment: scroll;" 
      + " color: #BBBBBB;" 
      + "}" 
      + "</style>" 
      + "</head>" 
      + "<body>" 
      + "<h1>Heading 1</h1>"; 
    private final String PARAGRAPH = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean eu nulla urna. Donec sit amet risus nisl, a porta enim. Quisque luctus, ligula eu scelerisque gravida, tellus quam vestibulum urna, ut aliquet sapien purus sed erat. Pellentesque consequat vehicula magna, eu aliquam magna interdum porttitor. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Sed sollicitudin sapien non leo tempus lobortis. Morbi semper auctor ipsum, a semper quam elementum a. Aliquam eget sem metus."; 

    BackgroundImageInHTML() { 
     initializGui(); 
    } 

    public void initializGui() { 
     gui = new JPanel(new BorderLayout()); 
     gui.setBorder(new EmptyBorder(5, 5, 5, 5)); 
     // TODO - not ideal 
     gui.setPreferredSize(new Dimension(400, 100)); 

     StringBuilder sb = new StringBuilder(); 
     sb.append(HTML); 
     for (int ii = 0; ii < 10; ii++) { 
      sb.append("<h2>Header 2</h2>"); 
      sb.append(PARAGRAPH); 
     } 
     JEditorPane jep = new JEditorPane(); 
     jep.setOpaque(false); 
     jep.setContentType("text/html"); 
     jep.setText(sb.toString()); 
     JScrollPane jsp = new JScrollPane(jep) { 
      BufferedImage bg = new BufferedImage(350,50,BufferedImage.TYPE_INT_RGB); 
      @Override 
      public void paintComponent(Graphics g) { 
       super.paintComponent(g); 
       g.drawImage(bg, 0, 0, this); 
      } 
     }; 
     jsp.getViewport().setOpaque(false); 
     gui.add(jsp); 
    } 

    public JComponent getGui() { 
     return gui; 
    } 

    public static void main(String[] args) { 
     Runnable r = new Runnable() { 

      @Override 
      public void run() { 

       BackgroundImageInHTML bih = new BackgroundImageInHTML(); 

       JFrame f = new JFrame("Demo"); 
       f.add(bih.getGui()); 
       // Ensures JVM closes after frame(s) closed and 
       // all non-daemon threads are finished 
       f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
       // See http://stackoverflow.com/a/7143398/418556 for demo. 
       f.setLocationByPlatform(true); 

       // ensures the frame is the minimum size it needs to be 
       // in order display the components within it 
       f.pack(); 
       // should be done last, to avoid flickering, moving, 
       // resizing artifacts. 
       f.setVisible(true); 
      } 
     }; 
     // Swing GUIs should be created and updated on the EDT 
     // http://docs.oracle.com/javase/tutorial/uiswing/concurrency 
     SwingUtilities.invokeLater(r); 
    } 
}

來源

2014-01-12 13:03:19

帶有修復程序的JScrollPane中的JEditorPane背景圖片

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